<div ngbDropdown
     placement="bottom-right">
  <a ngbDropdownToggle
     i18n-title
     title="Select a Language">
    {{ allLanguages[selectedLanguage] }}
  </a>
  <div ngbDropdownMenu>
    <ng-container *ngFor="let lang of supportedLanguages | keyvalue">
      <button ngbDropdownItem
              (click)="changeLanguage(lang.key)">
        {{ lang.value }}
      </button>
    </ng-container>
  </div>
</div>
